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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c9e44bd84d505b259e5eb44339fba368a8a05c2e6cc5e50cae34d1b91da943' 
  AND token = 'GTnuag85AHqgnP9iqbnSuf0i3e7P9a4OlUzcfaVbjVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}